To be caught in one's own trap or to have one's plans backfire.

किसी के ही चाल में फंसना या अपनी योजना का उल्टा पड़ना

English Usage: The politician was hoisted with his own petard when his false allegations were proven wrong.

Hindi Usage: नेता अपनी ही चाल में फंस गया जब उसके झूठे आरोप गलत साबित हुए।